Four-dimensional variational chemical assimilation of CRISTA stratospheric measurements
نویسندگان
چکیده
منابع مشابه
Downscaling of radio brightness measurements for soil moisture estimation: A four-dimensional variational data assimilation approach
This paper investigates the feasibility of estimating large-scale soil moisture profiles and related land surface variables from 1.4 GHz (L-band) passive microwave measurements, using variational data assimilation. Our four-dimensional assimilation algorithm takes into account both model and measurement uncertainties and provides dynamically consistent interpolation and extrapolation of remote ...
متن کاملAn ensemble-based explicit four-dimensional variational assimilation method
[1] The adjoint and tangent linear models in the traditional four-dimensional variational data assimilation (4DVAR) are difficult to obtain if the forecast model is highly nonlinear or the model physics contains parameterized discontinuities. A new method (referred to as POD-E4DVAR) is proposed in this paper by merging the Monte Carlo method and the proper orthogonal decomposition (POD) techniq...
متن کاملFour-Dimensional Data Assimilation
Surface inhomogeneities, including boundaries between different types of vegetations and land use patterns, have important effects on the structure of the atmospheric boundary layer. Changes in the surface roughness, temperature and wetness make the planetary boundary layer (PBL) nonhomogeneous and produce substantial horizontal gradients of boundary layer properties. Significant differences in...
متن کاملVariational chemical data assimilation with approximate adjoints
6 Data assimilation obtains improved estimates of the state of a physical system by com7 bining imperfect model results with sparse and noisy observations of reality. In the four 8 dimensional variational (4D-Var) framework data assimilation is formulated as an opti9 mization problem, which is solved using gradient based optimization methods.The 4D10 Var gradient is obtained by forcing the adjo...
متن کاملAssimilation of stratospheric ozone in the chemical transport model STRATAQ
We describe a sequential assimilation approach useful for assimilating tracer measurements into a threedimensional chemical transport model (CTM) of the stratosphere. The numerical code, developed largely according to Khattatov et al. (2000), uses parameterizations and simplifications allowing assimilation of sparse observations and the simultaneous evaluation of analysis errors, with reasonabl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Atmospheres
سال: 2001
ISSN: 0148-0227
DOI: 10.1029/2001jd900010